I study the formation and evolution of galaxies, mainly by using computer simulations.
I have studied how gas gets
in
and
out
of galaxies, how galaxy clusters
merge
together,
the properties of the
brightest members
of the galaxy population, and
how the overall galaxy population relates to the
extragalactic background light.
Most of my recent work focuses on
galaxy mergers and interactions around our neighbor galaxy
M31,
the Andromeda Galaxy.
I am particularly interested in using
advanced statistical methods
to confront dynamical models with observations of M31.

The animation here
depicts the formation of the giant stellar stream in the Andromeda galaxy.